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All-optical logic gates based on cross phase modulation effect in a phase-shifted grating.

Qiliang Li, Junfeng Song, Xin Chen

|September 9, 2016

Summary

This study demonstrates all-optical logic gates using cross-phase modulation (XPM) in phase-shifted gratings. By controlling pump light, various logic operations like NOT, AND, NAND, OR, XOR, and XNOR gates are achieved by altering phase shifts.

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Quasi-light Storage for Optical Data Packets

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Published on: February 6, 2014

Area of Science:

Photonics and Optical Engineering
Quantum Information Science
Nonlinear Optics

Background:

All-optical logic gates offer potential for high-speed information processing.
Cross-phase modulation (XPM) is a key nonlinear optical phenomenon for all-optical switching.
Phase-shifted gratings provide a tunable platform for manipulating light-light interactions.

Purpose of the Study:

To theoretically investigate the implementation of all-optical logic gates.
To explore the use of cross-phase modulation (XPM) in phase-shifted gratings for optical switching.
To demonstrate the realization of various logic gates by controlling pump light and grating phase shifts.

Main Methods:

Theoretical analysis of all-optical logic gates.
Utilizing cross-phase modulation (XPM) in phase-shifted gratings.
Investigating the switching characteristics of continuous wave (cw) light controlled by pump light.

Main Results:

Successfully demonstrated NOT, AND, and NAND gates in a zero phase shift grating.
Implemented NAND and OR gates in a phase-shifted grating with a π phase shift.
Achieved XOR and XNOR gates by selecting a phase shift of Δφ=3/2π.

Conclusions:

The phase shift of a phase-shifted grating is a critical parameter for realizing diverse all-optical logic gates.
This approach offers a flexible method for constructing various optical logic functions.
The findings contribute to the development of advanced all-optical signal processing and computing systems.